import sys, collections
input = lambda: sys.stdin.readline().rstrip() 
sys.setrecursionlimit(10**7)
INF = 10**10
def I(): return int(input())
def F(): return float(input())
def SS(): return input()
def LI(): return [int(x) for x in input().split()]
def LI_(): return [int(x)-1 for x in input().split()]
def LF(): return [float(x) for x in input().split()]
def LSS(): return input().split()

def resolve():
    n = I()
    S = LI()
    q = I()
    T = LI()

    cnt = 0
    for i in T:
        if i in S:
            cnt += 1
    
    print(cnt)

if __name__ == '__main__':
    resolve() import sys, collections sys collections input = lambda: sys.stdin.readline().rstrip() input lambda: sys.stdin.readline().rstrip() sys.stdin.readline().rstrip() sys.stdin.readline().rstrip sys.stdin.readline() sys.stdin.readline sys.stdin sys stdin readline rstrip sys.setrecursionlimit(10**7) sys.setrecursionlimit sys setrecursionlimit 10**7 10 7 INF = 10**10 INF 10**10 10 10 def I(): return int(input()) I def F(): return float(input()) F def SS(): return input() SS int(x) for x in input().split() for x in input().split() x input().split() ().split () input split for x in input().split() int(x) int x def LI(): return [int(x) for x in input().split()] LI int(x)-1 for x in input().split() for x in input().split() x input().split() ().split () input split for x in input().split() int(x)-1 int(x) int x 1 def LI_(): return [int(x)-1 for x in input().split()] LI_ float(x) for x in input().split() for x in input().split() x input().split() ().split () input split for x in input().split() float(x) float x def LF(): return [float(x) for x in input().split()] LF def LSS(): return input().split() LSS def resolve():
    n = I()
    S = LI()
    q = I()
    T = LI()

    cnt = 0
    for i in T:
        if i in S:
            cnt += 1
    
    print(cnt) resolve n = I() n I() I S = LI() S LI() LI q = I() q I() I T = LI() T LI() LI cnt = 0 cnt 0 for i in T:
        if i in S:
            cnt += 1
    
     i T if i in S:
            cnt += 1
    
     i in S i S cnt += 1 cnt 1 print(cnt) print cnt if __name__ == '__main__':
    resolve() __name__ == '__main__' __name__ '__main__' resolve() resolve def LI(): return [int(x) for x in input().split()] def LI(): return [int(x) for x in input().split()] LI input = lambda: sys.stdin.readline().rstrip() lambda: sys.stdin.readline().rstrip() input def I(): return int(input()) def I(): return int(input()) I def F(): return float(input()) def F(): return float(input()) F def LI_(): return [int(x)-1 for x in input().split()] def LI_(): return [int(x)-1 for x in input().split()] LI_ INF = 10**10 10**10 INF def LF(): return [float(x) for x in input().split()] def LF(): return [float(x) for x in input().split()] LF def LSS(): return input().split() def LSS(): return input().split() LSS def resolve():
    n = I()
    S = LI()
    q = I()
    T = LI()

    cnt = 0
    for i in T:
        if i in S:
            cnt += 1
    
    print(cnt) def resolve():
    n = I()
    S = LI()
    q = I()
    T = LI()

    cnt = 0
    for i in T:
        if i in S:
            cnt += 1
    
    print(cnt) resolve def SS(): return input() def SS(): return input() SS
import sys, collections
input = lambda: sys.stdin.readline().rstrip() 
sys.setrecursionlimit(10**7)
INF = 10**10
def I(): return int(input())
def F(): return float(input())
def SS(): return input()
def LI(): return [int(x) for x in input().split()]
def LI_(): return [int(x)-1 for x in input().split()]
def LF(): return [float(x) for x in input().split()]
def LSS(): return input().split()

def resolve():
    n = I()
    S = LI()
    q = I()
    T = LI()

    cnt = 0
    for i in T:
        if i in S:
            cnt += 1
    
    print(cnt)

if __name__ == '__main__':
    resolve()
